xylem
Concise Oxford English Dictionary © 2008 Oxford University Press:
xylem /ˈzʌɪləm/
▶noun Botany the vascular tissue in plants which conducts water and dissolved nutrients upwards from the root and also helps to form the woody element in the stem.
– origin C19: from Gk xulon ‘wood’ + the passive suffix -ēma.
'xylem' also found in these Oxford entries:

